Duffel bag



FIG. 1 is a front perspective view of a duffel bag showing our new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

The portions of the duffel bag shown in broken lines and without shading, and broken lines showing stitching and zipper pathways within the shaded areas, form no part of the claimed design. 

CLAIM The ornamental design for a duffel bag, as shown and described. 